FAQ Knowledge Articles

Tempered glass is strengthened glass.

Glass tempering is the process of heating annealed (standard) glass to extreme temperatures (1,200 degrees F) and then rapidly cooling it with air. The resulting piece of glass is approximately two to four times stronger than a piece of annealed. The increased strength is the result of permanently locking the outer surface molecule of the glass in compression and the center portion in compensating tension.  There may be a slight amount of distortion, but this due to the process and is normal.  The tempered glass logo is required by code/safety regulations.